MAGNITUDE OF A VECTOR
The magnitude of a vector a, sometimes called the modulus of the vector is represented by |a|.
Zero Vector: The zero vector is a vector with zero magnitude.
Unit Vector: The unit vector is the vector represented by a and is such that a = |a| a
Negative Vector: The negative vector of a is written as – a
Equality of vector: Two vectors are equal when they have same magnitude and direction.